Diphenylcarbazide

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Description

White crystalline powder used for the colorimetric detection of chromium in metals, tanned leather, and pigments (Odegaard et al 2000). Diphenylcarbazide gives a dark blue-violet positive reaction. Other metals, such as cadmium, mercury, magnesium, silver, nickel, tin, and aluminum will also react with diphenylcarbazide.

Synonyms and Related Terms

2,2'-diphenylcarbonic dihydrazide; 1,5-diphenylcarbazide; S-diphenylcarbazide; DPC

Chemical structure

Diphenylcarbazide.jpg


Other Properties

Slightly soluble in water. Soluble in hot alcohol, acetone, glacial acetic acid

Composition C33H14N4O
CAS 140-22-7
Melting Point 168-171
Molecular Weight mol. wt. = 242.27

Hazards and Safety

Degrades in light.

May be harmful by ingestion or inhalation. Contact may cause irritation.

Mallinckrodt Baker: MSDS

Additional Information

N.Odegaard, S.Carroll, W.Zimmt, Material Characterization Tests for Objects of Art and Archaeology Archetype Publications, London, 2000, p.44.

Sources Checked for Data in Record

  • The Merck Index, Susan Budavari (ed.), Merck Research Labs, Whitehouse Station, NJ, 12th Edition, 1996 Comment: entry 3333
  • N.Odegaard, S.Carroll, W.Zimmt, Material Characterization Tests for Objects of Art and Archaeology, Archetype Publications, London, 2000